package com.example.multithreadclient;

import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.SocketTimeoutException;

import android.os.Looper;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}
 class MultiThreadClient extends Activity
{
    // 定义界面上的两个文本框
    EditText input;
    TextView show;
    // 定义界面上的一个按钮
    Button send;
    Handler handler;
    // 定义与服务器通信的子线程
    ClientThread clientThread;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        input = (EditText) findViewById(R.id.input);
        send = (Button) findViewById(R.id.send);
        show = (TextView) findViewById(R.id.show);
        handler = new Handler() //①
        {
            @Override
            public void handleMessage(Message msg)
            {
                // 如果消息来自于子线程
                if (msg.what == 0x123)
                {
                    // 将读取的内容追加显示在文本框中
                    show.append("\n" + msg.obj.toString());
                }
            }
        };
        clientThread = new ClientThread(handler);
        // 客户端启动ClientThread线程创建网络连接、读取来自服务器的数据
        new Thread(clientThread).start(); //①
        send.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                try
                {
                    // 当用户按下发送按钮后，将用户输入的数据封装成Message，
                    // 然后发送给子线程的Handler
                    Message msg = new Message();
                    msg.what = 0x345;
                    msg.obj = input.getText().toString();
                    clientThread.revHandler.sendMessage(msg);
                    // 清空input文本框
                    input.setText("");
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        });
    }
}

 class ClientThread implements Runnable
{
    private Socket s;
    // 定义向UI线程发送消息的Handler对象
    private Handler handler;
    // 定义接收UI线程的消息的Handler对象
    public Handler revHandler;
    // 该线程所处理的Socket所对应的输入流
    BufferedReader br = null;
    OutputStream os = null;

    public ClientThread(Handler handler)
    {
        this.handler = handler;
    }

    public void run()
    {
        try
        {
            s = new Socket("192.168.1.88", 30000);
            br = new BufferedReader(new InputStreamReader(
                    s.getInputStream()));
            os = s.getOutputStream();
            // 启动一条子线程来读取服务器响应的数据
            new Thread()
            {
                @Override
                public void run()
                {
                    String content = null;
                    // 不断读取Socket输入流中的内容。
                    try
                    {
                        while ((content = br.readLine()) != null)
                        {
                            // 每当读到来自服务器的数据之后，发送消息通知程序界面显示该数据
                            Message msg = new Message();
                            msg.what = 0x123;
                            msg.obj = content;
                            handler.sendMessage(msg);
                        }
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                    }
                }
            }.start();
            // 为当前线程初始化Looper
            Looper.prepare();
            // 创建revHandler对象
            revHandler = new Handler()
            {
                @Override
                public void handleMessage(Message msg)
                {
                    // 接收到UI线程中用户输入的数据
                    if (msg.what == 0x345)
                    {
                        // 将用户在文本框内输入的内容写入网络
                        try
                        {
                            os.write((msg.obj.toString() + "\r\n")
                                    .getBytes("utf-8"));
                        }
                        catch (Exception e)
                        {
                            e.printStackTrace();
                        }
                    }
                }
            };
            // 启动Looper
            Looper.loop();
        }
        catch (SocketTimeoutException e1)
        {
            System.out.println("网络连接超时！！");
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}


